System and method of gathering and caching WLAN packet information to improve position estimates of a WLAN positioning device

a positioning device and packet information technology, applied in the field of wlan-based positioning systems, to achieve the effect of improving the position estimation of the wlan positioning devi

Active Publication Date: 2008-01-10
SKYHOOK WIRELESS
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  • Abstract
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  • Application Information

AI Technical Summary

Benefits of technology

[0041]Under another aspect of the invention, the times of reception information and the extracted identify information are communicated to the WLAN-based positioning system to improve tracking of said device.

Problems solved by technology

Each of these approaches has its strengths and weaknesses based on the radio technology and the positioning algorithms they employ.

Method used

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  • System and method of gathering and caching WLAN packet information to improve position estimates of a WLAN positioning device
  • System and method of gathering and caching WLAN packet information to improve position estimates of a WLAN positioning device
  • System and method of gathering and caching WLAN packet information to improve position estimates of a WLAN positioning device

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Embodiment Construction

[0053]Preferred embodiments of the invention provide a dedicated device that gathers wireless signal information for use by clients of a WLAN positioning system (herein “WPS dedicated device” or “dedicated device”). The dedicated device detects WLAN access points (APs) and provides AP signal information to a WPS for use in estimating the position, the velocity, and direction of travel of the device. The dedicated device for use with a WPS is designed to collect information from as many detectable WLAN access point signals as possible, while also minimizing power consumption and device cost.

[0054]In one illustrative implementation, the receiver of a WPS dedicated device extracts MAC address from all the packets, including broadcast, multicast, unicast, and data packets, which are detected on the air by the device's receiver to create a list of surrounding APs. That is, even packets with target addresses other than the dedicated device are detected and used to estimate position of the...

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Abstract

Methods and systems of gathering and caching WLAN packet information to improve position estimates of a WLAN positioning device. A device estimates the position of itself. The device includes a WLAN radio module for receiving WLAN signals transmitted by WLAN APs in range of said device, extraction logic for extracting information from said received WLAN signals to identify the WLAN APs, and logic to cooperate with a WLAN-based positioning system to estimate the position of the device based at least in part on the extracted information identifying the WLAN APs in the range of said device. The extraction logic includes logic for caching the extracted identities and logic for caching information indicating the time of reception of the signals transmitted by the corresponding WLAN AP. And, the logic to cooperate considers the cached time information when providing extracted and cached information to said WLAN-based positioning system.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit under 35 U.S.C. §119(e) to the following U.S. Provisional Patent Application, the contents of which is incorporated by reference herein:[0002]U.S. Provisional Patent Application No. 60 / 819,182, entitled Use of a Client-Side Receive-Only WLAN Device In a WLAN Positioning System, filed on Jul. 7, 2006.[0003]This application is related to the following U.S. Applications:[0004]U.S. patent application Ser. No. 11 / 261,848, entitled Location Beacon Database, filed on Oct. 28, 2005;[0005]U.S. patent application Ser. No. 11 / 261,898, entitled Server for Updating Location Beacon Database, filed on Oct. 28, 2005;[0006]U.S. patent application Ser. No. 11 / 261,988, entitled Location-Based Services that Choose Location Algorithms Based on Number of Detected Access Points Within Range of User Device, filed on Oct. 28, 2005;[0007]U.S. patent application Ser. No. 11 / 261,987, entitled Method and System for Building a Locat...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04Q7/00G01S5/02H04W4/02H04W64/00H04W84/12
CPCG01S5/02H04W4/02G01S5/0242H04W84/12H04B7/26H04W64/00G01S5/019
Inventor ALIZADEH-SHABDIZ, FARSHID
Owner SKYHOOK WIRELESS
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